Support for animated stickers

TGS are gzipped Lottie-Animations.

harbour-fernschreiber.pro

@@ -14,10 +14,12 @@ TARGET = harbour-fernschreiber
 
 CONFIG += sailfishapp sailfishapp_i18n
 
-PKGCONFIG += nemonotifications-qt5 ngf-qt5
+PKGCONFIG += nemonotifications-qt5 ngf-qt5 zlib
 
 QT += core dbus sql
 
+DEFINES += QT_STATICPLUGIN
+
 SOURCES += src/harbour-fernschreiber.cpp \
     src/appsettings.cpp \
     src/chatlistmodel.cpp \
@@ -31,7 +33,8 @@ SOURCES += src/harbour-fernschreiber.cpp \
     src/stickermanager.cpp \
     src/tdlibfile.cpp \
     src/tdlibreceiver.cpp \
-    src/tdlibwrapper.cpp
+    src/tdlibwrapper.cpp \
+    src/tgsplugin.cpp
 
 DISTFILES += qml/harbour-fernschreiber.qml \
     qml/components/AudioPreview.qml \
@@ -145,7 +148,8 @@ HEADERS += \
     src/tdlibfile.h \
     src/tdlibreceiver.h \
     src/tdlibsecrets.h \
-    src/tdlibwrapper.h
+    src/tdlibwrapper.h \
+    src/tgsplugin.h
 
 # https://github.com/Samsung/rlottie.git
 

qml/components/StickerPreview.qml

@@ -18,59 +18,57 @@
 */
 import QtQuick 2.6
 import Sailfish.Silica 1.0
+import WerkWolf.Fernschreiber 1.0
 
 Item {
-
     property ListItem messageListItem
-    property var rawMessage: messageListItem.myMessage
 
-    property var stickerData: rawMessage.content.sticker;
-    property int usedFileId;
+    readonly property var stickerData: messageListItem.myMessage.content.sticker;
+    readonly property bool animated: stickerData.is_animated
+    readonly property bool stickerVisible: staticStickerLoader.item ? staticStickerLoader.item.visible :
+        animatedStickerLoader.item ? animatedStickerLoader.item.visible : false
 
+    implicitWidth: stickerData.width
+    implicitHeight: stickerData.height
+
+    TDLibFile {
+        id: file
+        tdlib: tdLibWrapper
+        fileInformation: stickerData.sticker
+        autoLoad: true
+    }
+
+    Item {
         width: stickerData.width
         height: stickerData.height
+        // (centered in image mode, text-like in sticker mode)
+        x: appSettings.showStickersAsImages ? (parent.width - width)/2 :
+            messageListItem.isOwnMessage ? (parent.width - width) : 0
+        anchors.verticalCenter: parent.verticalCenter
 
-    Component.onCompleted: {
-        if (stickerData) {
-            if (stickerData.is_animated) {
-                // Use thumbnail until we can decode TGS files
-                usedFileId = stickerData.thumbnail.photo.id;
-                if (stickerData.thumbnail.photo.local.is_downloading_completed) {
-                    stickerImage.source = stickerData.thumbnail.photo.local.path;
-                } else {
-                    tdLibWrapper.downloadFile(usedFileId);
-                }
-            } else {
-                usedFileId = stickerData.sticker.id;
-                if (stickerData.sticker.local.is_downloading_completed) {
-                    stickerImage.source = stickerData.sticker.local.path;
-                } else {
-                    tdLibWrapper.downloadFile(usedFileId);
-                }
-            }
-        }
-    }
-
-    Connections {
-        target: tdLibWrapper
-        onFileUpdated: {
-            if (stickerData) {
-                if (fileId === usedFileId && fileInformation.local.is_downloading_completed) {
-                    if (stickerData.is_animated) {
-                        stickerData.thumbnail.photo = fileInformation;
-                    } else {
-                        stickerData.sticker = fileInformation;
-                    }
-                    stickerImage.source = fileInformation.local.path;
-                }
-            }
-        }
-    }
-
-    Image {
-        id: stickerImage
+        Loader {
+            id: animatedStickerLoader
             anchors.fill: parent
+            active: animated
+            sourceComponent: Component {
+                AnimatedImage {
+                    anchors.fill: parent
+                    source: file.path
+                    asynchronous: true
+                    paused: !Qt.application.active
+                    cache: false
+                }
+            }
+        }
 
+        Loader {
+            id: staticStickerLoader
+            anchors.fill: parent
+            active: !animated
+            sourceComponent: Component {
+                Image {
+                    anchors.fill: parent
+                    source: file.path
                     fillMode: Image.PreserveAspectFit
                     autoTransform: true
                     asynchronous: true
@@ -78,6 +76,8 @@ Item {
                     opacity: status === Image.Ready ? 1 : 0
                     Behavior on opacity { FadeAnimation {} }
                 }
+            }
+        }
 
         Loader {
             anchors.fill: parent
@@ -86,9 +86,10 @@ Item {
             }
 
             active: opacity > 0
-        opacity: !stickerImage.visible && !placeHolderDelayTimer.running ? 0.15 : 0
+            opacity: !stickerVisible && !placeHolderDelayTimer.running ? 0.15 : 0
             Behavior on opacity { FadeAnimation {} }
         }
+    }
 
     Timer {
         id: placeHolderDelayTimer

src/harbour-fernschreiber.cpp

@@ -38,6 +38,9 @@
 #include "dbusadaptor.h"
 #include "processlauncher.h"
 #include "stickermanager.h"
+#include "tgsplugin.h"
+
+Q_IMPORT_PLUGIN(TgsIOPlugin)
 
 int main(int argc, char *argv[])
 {

src/tgsplugin.cpp

@@ -0,0 +1,310 @@
+/*
+    Copyright (C) 2020 Slava Monich at al.
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "tgsplugin.h"
+#include "rlottie.h"
+
+#include <QDebug>
+#include <QSize>
+#include <QImage>
+#include <QImageIOHandler>
+#include <QFileDevice>
+#include <QFileInfo>
+
+#include <zlib.h>
+
+#define LOG(x) qDebug() << "[TgsIOHandler]" << qPrintable(fileName) << x
+#define WARN(x) qWarning() << "[TgsIOHandler]" << qPrintable(fileName) << x
+
+class TgsIOHandler : public QImageIOHandler
+{
+public:
+    static const QByteArray NAME;
+    static const QByteArray GZ_MAGIC;
+    typedef std::string ByteArray;
+
+    TgsIOHandler(QIODevice* device, const QByteArray& format);
+    ~TgsIOHandler();
+
+    ByteArray uncompress();
+    bool load();
+    void render(int frameIndex);
+    void finishRendering();
+
+    // QImageIOHandler
+    bool canRead() const Q_DECL_OVERRIDE;
+    QByteArray name() const Q_DECL_OVERRIDE;
+    bool read(QImage* image) Q_DECL_OVERRIDE;
+    QVariant option(ImageOption option) const Q_DECL_OVERRIDE;
+    bool supportsOption(ImageOption option) const Q_DECL_OVERRIDE;
+    bool jumpToNextImage() Q_DECL_OVERRIDE;
+    bool jumpToImage(int imageNumber) Q_DECL_OVERRIDE;
+    int loopCount() const Q_DECL_OVERRIDE;
+    int imageCount() const Q_DECL_OVERRIDE;
+    int nextImageDelay() const Q_DECL_OVERRIDE;
+    int currentImageNumber() const Q_DECL_OVERRIDE;
+    QRect currentImageRect() const Q_DECL_OVERRIDE;
+
+public:
+    QString fileName;
+    QSize size;
+    qreal frameRate;
+    int frameCount;
+    int currentFrame;
+    QImage firstImage;
+    QImage prevImage;
+    QImage currentImage;
+    std::future<rlottie::Surface> currentRender;
+    std::unique_ptr<rlottie::Animation> animation;
+};
+
+const QByteArray TgsIOHandler::NAME("tgs");
+const QByteArray TgsIOHandler::GZ_MAGIC("\x1f\x8b");
+
+TgsIOHandler::TgsIOHandler(QIODevice* device, const QByteArray& format) :
+    frameRate(0.),
+    frameCount(0),
+    currentFrame(0)
+{
+    QFileDevice* file = qobject_cast<QFileDevice*>(device);
+    if (file) {
+        fileName = QFileInfo(file->fileName()).fileName();
+    }
+    setDevice(device);
+    setFormat(format);
+}
+
+TgsIOHandler::~TgsIOHandler()
+{
+    if (currentRender.valid()) {
+        currentRender.get();
+    }
+    LOG("Done");
+}
+
+TgsIOHandler::ByteArray TgsIOHandler::uncompress()
+{
+    ByteArray unzipped;
+    const QByteArray zipped(device()->readAll());
+    if (!zipped.isEmpty()) {
+        z_stream unzip;
+        memset(&unzip, 0, sizeof(unzip));
+        unzip.next_in = (Bytef*)zipped.constData();
+        // Add 16 for decoding gzip header
+        int zerr = inflateInit2(&unzip, MAX_WBITS + 16);
+        if (zerr == Z_OK) {
+            const uint chunk = 0x1000;
+            unzipped.resize(chunk);
+            unzip.next_out = (Bytef*)unzipped.data();
+            unzip.avail_in = zipped.size();
+            unzip.avail_out = chunk;
+            LOG("Compressed size" << zipped.size());
+            while (unzip.avail_out > 0 && zerr == Z_OK) {
+                zerr = inflate(&unzip, Z_NO_FLUSH);
+                if (zerr == Z_OK && unzip.avail_out < chunk) {
+                    // Data may get relocated, update next_out too
+                    unzipped.resize(unzipped.size() + chunk);
+                    unzip.next_out = (Bytef*)unzipped.data() + unzip.total_out;
+                    unzip.avail_out += chunk;
+                }
+            }
+            if (zerr == Z_STREAM_END) {
+                unzipped.resize(unzip.next_out - (Bytef*)unzipped.data());
+                LOG("Uncompressed size" << unzipped.size());
+            } else {
+                unzipped.clear();
+            }
+            inflateEnd(&unzip);
+        }
+    }
+    return unzipped;
+}
+
+bool TgsIOHandler::load()
+{
+    if (!animation && device()) {
+        ByteArray json(uncompress());
+        if (json.size() > 0) {
+            animation = rlottie::Animation::loadFromData(json, std::string(), std::string(), false);
+            if (animation) {
+                size_t width, height;
+                animation->size(width, height);
+                frameRate = animation->frameRate();
+                frameCount = (int) animation->totalFrame();
+                size = QSize(width, height);
+                LOG(size << frameCount << "frames," << frameRate << "fps");
+                render(0); // Pre-render first frame
+            }
+        }
+    }
+    return animation != Q_NULLPTR;
+}
+
+void TgsIOHandler::finishRendering()
+{
+    if (currentRender.valid()) {
+        currentRender.get();
+        prevImage = currentImage;
+        if (!currentFrame && !firstImage.isNull()) {
+            LOG("Rendered first frame");
+            firstImage = currentImage;
+        }
+    } else {
+        // Must be the first frame
+        prevImage = currentImage;
+    }
+}
+
+void TgsIOHandler::render(int frameIndex)
+{
+    currentFrame = frameIndex % frameCount;
+    if (!currentFrame && !firstImage.isNull()) {
+        // The first frame only gets rendered once
+        currentImage = firstImage;
+    } else {
+        const int width = (int)size.width();
+        const int height = (int)size.height();
+        currentImage = QImage(width, height, QImage::Format_ARGB32_Premultiplied);
+        currentRender = animation->render(currentFrame,
+            rlottie::Surface((uint32_t*)currentImage.bits(),
+                width, height, currentImage.bytesPerLine()));
+    }
+}
+
+bool TgsIOHandler::read(QImage* out)
+{
+    if (load() && frameCount > 0) {
+        // We must have the first frame, will wait if necessary
+        if (currentFrame && currentRender.valid()) {
+            std::future_status status = currentRender.wait_for(std::chrono::milliseconds(0));
+            if (status != std::future_status::ready) {
+                LOG("Skipping frame" << currentFrame);
+                currentFrame = (currentFrame + 1) % frameCount;
+                *out = prevImage;
+                return true;
+            }
+        }
+        finishRendering();
+        *out = currentImage;
+        render(currentFrame + 1);
+        return true;
+    }
+    return false;
+}
+
+bool TgsIOHandler::canRead() const
+{
+    if (!device()) {
+        return false;
+    } else if (animation) {
+        return true;
+    } else {
+        // Need to support uncompressed data?
+        return device()->peek(2) == GZ_MAGIC;
+    }
+}
+
+QByteArray TgsIOHandler::name() const
+{
+    return NAME;
+}
+
+QVariant TgsIOHandler::option(ImageOption option) const
+{
+    switch (option) {
+    case Size:
+        ((TgsIOHandler*)this)->load(); // Cast off const
+        return size;
+    case Animation:
+        return true;
+    case ImageFormat:
+        return QImage::Format_ARGB32_Premultiplied;
+    default:
+        break;
+    }
+    return QVariant();
+}
+
+bool TgsIOHandler::supportsOption(ImageOption option) const
+{
+    switch(option) {
+    case Size:
+    case Animation:
+    case ImageFormat:
+        return true;
+    default:
+        break;
+    }
+    return false;
+}
+
+bool TgsIOHandler::jumpToNextImage()
+{
+    if (frameCount) {
+        finishRendering();
+        render(currentFrame + 1);
+        return true;
+    }
+    return false;
+}
+
+bool TgsIOHandler::jumpToImage(int imageNumber)
+{
+    if (frameCount) {
+        if (imageNumber != currentFrame) {
+            finishRendering();
+            render(imageNumber);
+        }
+        return true;
+    }
+    return false;
+}
+
+int TgsIOHandler::loopCount() const
+{
+    return -1;
+}
+
+int TgsIOHandler::imageCount() const
+{
+    return frameCount;
+}
+
+int TgsIOHandler::currentImageNumber() const
+{
+    return currentFrame;
+}
+
+QRect TgsIOHandler::currentImageRect() const
+{
+    return QRect(QPoint(), size);
+}
+
+int TgsIOHandler::nextImageDelay() const
+{
+    return frameRate > 0 ? (int)(1000/frameRate) : 33;
+}
+
+QImageIOPlugin::Capabilities TgsIOPlugin::capabilities(QIODevice*, const QByteArray& format) const
+{
+    return Capabilities((format == TgsIOHandler::NAME) ? CanRead : 0);
+}
+
+QImageIOHandler* TgsIOPlugin::create(QIODevice* device, const QByteArray& format) const
+{
+    return new TgsIOHandler(device, format);
+}

src/tgsplugin.h

@@ -0,0 +1,33 @@
+/*
+    Copyright (C) 2020 Slava Monich at al.
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef TGS_IMAGE_IO_PLUGIN
+#define TGS_IMAGE_IO_PLUGIN
+
+#include <QStringList>
+#include <QImageIOPlugin>
+
+class TgsIOPlugin : public QImageIOPlugin
+{
+    Q_OBJECT
+    Q_PLUGIN_METADATA(IID "org.qt-project.Qt.QImageIOHandlerFactoryInterface" FILE "tgsplugin.json")
+public:
+    Capabilities capabilities(QIODevice* device, const QByteArray& format) const Q_DECL_OVERRIDE;
+    QImageIOHandler* create(QIODevice* device, const QByteArray& format) const Q_DECL_OVERRIDE;
+};
+
+#endif // TGS_IMAGE_IO_PLUGIN

src/tgsplugin.json

@@ -0,0 +1,3 @@
+{
+    "Keys": [ "tgs" ]
+}